Brush-holder for dynamo-electric machines.



c. B. MILLS.

BRUSH HOLDER FOR'ifYNAMO ELECTRIC MACHINES. APPLICATION FILED MAY 9, 1911- RENEWED FEB. 1.1912.

' 1,168,021. Patented Jan. 11; 1916.

WITNESSES;

[- UNITED sTATEsrA rENT CHESTER n. MILLS, or EAST nexEEsron'r, PENNSYLVANIA, ASSIGNOR "rows-slime- HOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION origamisYLvnNIA.

Application filed Kay 9, 1911, Serial No. 626,111.

To all whom it may aoncem Be it known that I, CHESTER B. Mums,- a citizen of the United States, and a resident of East McKeesport, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Brush-Holdersfor Dynamo-Electric Machines, of which the following is a specification.

- main or spiral portion thereof and bears upon the outer end of the brush 5, the brush box being rovided with slots 8 to receive the end of t e spring? Theend of the brush- My invention" relates to brush-holders for dynamo-electric machines, and it has for. its object to provide a useful and desirable brush-holder which can be conveniently and inexpensiv'ely'made from sheet metal .parts.

Figure 1 of the accompanying drawing is a side view of a portion of a motor having a brush-holder embodying my invention. Fig. 2 is a side view of two of the brushholders and their support, and Fig. 3 is a plan view of one of the brush-holders.

The brush-holder comprises two'side-b y side pieces of sheet metal 1 and- 2, the body portions of which are substantially rectangular in shape and are respectively bentto form laterally extending nested 'U-shaped .projections3 and 4 of diiferent lengths between Whichis a substantially rectangular space constituting a box for the brush 5.

The-end of the longer U-shaped projection.

4; is bent or curved inwardly at 4:, in order that it may;engage the side of the brush and thus prevent the sharp corners thereof from engaging the rounded corners of the bent sheet metal. In this manner, much greater holder that is opposite the socket 6 is provided with a screw 9 that constitutes a binding post for connecting the brush-holder to a circuit and also for one end of a conductor 10 that extends therefrom to the brush.

The two sheet metal plates constituting the brush-holder are clamped together, and to an insulating block-11 constituting asup- BRUSH-HOLDER FOR DYNAMOELECTRIG MACHINES..

Specification of Letters Patent.

. wardly.

"Patented Jan. 11,1916. Renewed February 1, 1912.; Serial 110167-38.

port therefor, by means oflbolts 12, theblbck 11 being The structure hereinbef ore set forth. is both nexpensive and compact and is so formed as to provide a brush-holding box and a spring support that projectlaterally from one side of the body portion which is clamped to one face of an adjustable insulating and supporting block. It is thus apparcut that a strong and efl'ectively insulated brush holder structure is provided which embodies a minimum number of eflfectively disposed parts. a The form, dimensions and relations of parts are, of course, subject to modification w thin the scope of the appended claims;-

I claim as my invention:

1. A brush-holder compr1sing two si'deby-side' 'pieces. of sheet metal, having U- shaped portions of difierent lengths nested together to form a brush'box.

2. A brushsholder comprising two sideby-side pieces of sheet metal'ha-ving U- shaped portions of different lengths nested together to form a brush box and laterally extending :end portions, and a spring carmounted' upon and adjustably" clamped to the end bracket 13 of asymmeelectnc machine 14 by clamping devices 15.

ried by the said end portions and extending over the brush box.

3. A brush-holder comprisin gptwo sideby -side pieces of sheet metal. haying U- shaped portions of difierent length s falested together to form a brush-box,'the end-of the longer U-shaped portion] being curved; in-

4. A 'brush-ho1der"comprising two sideby-side pieces of sheet ,metal having U- shaped portions of difierent-lengthsnested together to'form a brush box and laterally extending end portions, anda spring clamped between the said end portionsand extending over thebrush box.

.5. Ar brush holder comprising two sideby-side pieces of sheet metal, intermediate portions of *whichfare spaced apart to form a brush box between them andend portions of which are- -.extended laterally, and a spring clampedbetween thefsaid end portions and extending overthe brush box.

6. A brush-holder comprising two sideby-side pieces of sheet metal having U- shaped portions of different lengths nested together to form a brush box, the end of thelonger U-shaped portion being curved able brus inwardly, the said pieces also having laterally extending end portions, and a spring carried by the said end portions and extending over the box.

7. A brush-holder comprising two sideby-side pieces of sheet metal having U- shaped portions of different lengths nested together to form a brush box, and a spring carried by the said pieces and extending over the brush box. v

8. In a dynamo-electric machine, the combination with an adjustable insulating block, of a brush holder clamped to said block and comprising two superposed pieces of sheet metal, one of which has a laterally bent box portion adaptedto receive a mov- 9. In a dynamo-electric machine, the combination with -an adjustable insulating block, of a brush holder. comprising two superposed pieces of sheet metal, one of which has a laterally projecting intermediate portion of box form to receive a brush and both'of which have their end portions clamped to one side of said insulating block.

10. In a dynamo-electric machine, the combination with a bracket and an adjustable insulating block clamped thereto, of

a brush holder comprising two superposed pieces of sheet metal having their ends clamped to one side of said block and their middle portions shaped to constitute a box for a movable brush.

11. In a dynamo-electric machine, the combination with an adjustable insulating block and a support therefor, of a brush holder comprising two pieces of sheet metal having their ends clamped to one side of said block and shaped to constitute an intermediate box for a movable brush.

12. In a dynamo-electric machine, the combination with an adjustable insulating block and a support therefor, of a brush holder comprising a double-layer sheet metal body having its ends clamped to one face of said block and shaped to constitute an intermediate laterally projecting box for a movable brush.

In testimony whereof, I have hereunto subscribed my name this 24th day of April, 1911.

CHESTER B. MILLS. 

